<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../node_modules/vue/dist/vue.js"></script>
</head>
<body>
    <div id="root">
        姓：<input type='text' v-model="firstName"><br><br>
        名：<input type='text' v-model="lastName"><br><br>
        姓名：<span>{{fullName}}</span>
    </div>
    <script type="text/javascript">
        let vm = new Vue({
            el:'#root',
            data:{
                firstName:'张',
                lastName:'三',
            },
            computed:{
                fullName:{
                    get(){
                       console.log('get被调用了');
                       return firstName+lastName;
                    },
                },
            },
        });
    </script>
</body>
</html>
